Data Sheet

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Note

If letter R is in the register description it stands for the read-only variable. If letter W is in the register

description it stands for write variable. If letters RW are in the register description it stands for variable

possible to read and write into at the same time (i.e. its values can change not depending on the program

– e.g. CNT).

3.4 Function description

3.4.1 Digital input functions

Correct behavior of digital inputs depends on configuration of Debounce variable depending on

connected switch and on the environment in which the device is installed.

3.4.1.1 Debounce

Function Debounce serves for input bounce repression, its value is presented in hundreds of µs (i.e.

value 100 equals 10 ms). Impulse (positive edge) is processed as valid only in case it equals logical 1

for the whole configured duration.

3.4.1.2 Counter

This function serves as a pulse counter (counter of positive edges) on digital inputs. With each valid

pulse its value is incremented by one and written into the variable. While exceeding the maximum value,

the counter is set to zero. The value can be programmatically changed by writing into the variable

CNT_set.

3.4.1.3 Direct switch

This function allows mapping of event or state of digital input to digital output within the group (moreover

the number of DI and DO/RO within the group must be the same). Enabling of the function is done by

writing True value into DS_enable of the desired digital input. If DS_enable variable is equal to False,

settings of DS_toggle and DS_polarity is ignored.

Note

Each input which allows DS has corresponding DS_enable, DS_polarity and DS_toggle variables. Thus,

it is possible to configure different behavior for each input.

DS_polarity

With this function, it is possible to achieve two states of behavior. If DS_polarity is set True the output

switches to the state opposite to of the input. Otherwise if set False the output value equals the input

value. Exact description of the behavior demonstrates the following table.

DS_polarity

Input

Output

True

False

True

False

True

DS_toggle

If this value is set True, after positive edge is detected on input, the output value of corresponding

output is negated(toggled).

3.4.2 Digital output functions

3.4.2.1 PWM

Pulse width modulation (PWM) serves for analog signal transmission with binary signal. PWM can be

activated for each digital output separately, but frequency (prescale and duty cycle) settings is only one

for each group. After enabling of PWM function it is first necessary to set DO variable of chosen output

to 0 and then change the PWM variable value. PWM variable value states the period length of logical 1

in the number of cycles on the given output.